

#include <iostream>
#include <algorithm>
#include <vector>


void test_case1() {

    std::vector<int> coll = {9, 8, 7, 6, 5, 4, 3, 2, 1};

    std::nth_element(coll.begin(), coll.begin() + 1, coll.end());
    std::cout << "the forth lowest elements are: " << std::endl;

    for (auto elem : coll) 
        std::cout << elem;

}

int main() {

    test_case1();

    return 0;
}